<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录的表单区域 -->
      <el-form
        ref="loginFormRef"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
        :model="loginForm"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            type="password"
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
          ></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button :plain="true" type="primary" @click="login"
            >登录</el-button
          >
          <el-button type="info" @click="resetFormLogin">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'App',
  data() {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: '',
        password: ''
      },
      // 这是表单验证的对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 11, message: '长度在 6 到 11 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  // 点击重置按钮，重置登录表单
  methods: {
    resetFormLogin() {
      this.$refs.loginFormRef.resetFields()
    },
    // 登录
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        // 判断表单验证是否通过
        if (!valid) return
        // axios请求后接收到返回的数据
        const { data: res } = await this.$http.post('login', this.loginForm)
        // 判断用户是否存在
        if (res.meta.status !== 200) return this.$message.error('登陆失败')
        // 用户登录成功
        this.$message({
          message: '恭喜你，登录成功',
          type: 'success'
        })
        // 将服务器传的token赋给用户
        window.sessionStorage.setItem('token', res.data.token)
        // 登录成功后页面跳转
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background: #2b4b6b;
  height: 100%;
}
.login_box {
  background: #fff;
  width: 450px;
  height: 300px;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  width: 130px;
  height: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  background: #eee;
  position: absolute;
  left: 50%;
  top: 0;
  transform: translate(-50%, -50%);
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
  }
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 10px;
  box-sizing: border-box;
}
</style>
